books.google.no - Christian dualism originated in the reign of Constans II (641-68) It was a popular religion, which shared with Orthodoxy an acceptance of Scriptural authority and apostolic tradition and held a sacramental doctrine of salvation, but understood all these in a radically different way from the Orthodox...http://books.google.no/books/about/Christian_Dualist_Heresies_in_the_Byzant.html?hl=no&id=uH-8AAAAIAAJ&utm_source=gb-gplus-shareChristian Dualist Heresies in the Byzantine World, C. 650-c. 1450